Move the T block along to be one block to the left underneath the ?? block

Click it, and expand to get a <3

Click the <3 to charge

Move it along one again and expand. You now have two adjacent <3 blocks to make an 'engine'

You can now expand out the rest of the area using the same method. You should end up with two ---> blocks, and one |. You can use these blocks to move around the movement blocks so you can move an engine underneath the ?? block.